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If set to yes, when the registration expires, the friend will
vanish from the configuration until requested again. If set
to an integer, friends expire within this number of seconds
instead of the registration interval.

The phone will renew the registration before it expires, so maybe it
never "expires".

I have tried to set the rtautoclear to 60, but the result is the same,
the new password is never enforced.

Any suggestion apart from removing the rtcachefriends?

Leandro